ac97_pcm.c File Reference

#include <linux/delay.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/export.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/control.h>
#include <sound/ac97_codec.h>
#include <sound/asoundef.h>
#include "ac97_id.h"
#include "ac97_local.h"

Go to the source code of this file.

Functions
int	snd_ac97_set_rate (struct snd_ac97 *ac97, int reg, unsigned int rate)
	EXPORT_SYMBOL (snd_ac97_set_rate)
int	snd_ac97_pcm_assign (struct snd_ac97_bus *bus, unsigned short pcms_count, const struct ac97_pcm *pcms)
	EXPORT_SYMBOL (snd_ac97_pcm_assign)
int	snd_ac97_pcm_open (struct ac97_pcm *pcm, unsigned int rate, enum ac97_pcm_cfg cfg, unsigned short slots)
	EXPORT_SYMBOL (snd_ac97_pcm_open)
int	snd_ac97_pcm_close (struct ac97_pcm *pcm)
	EXPORT_SYMBOL (snd_ac97_pcm_close)
int	snd_ac97_pcm_double_rate_rules (struct snd_pcm_runtime *runtime)
	EXPORT_SYMBOL (snd_ac97_pcm_double_rate_rules)

Function Documentation

EXPORT_SYMBOL

(

snd_ac97_set_rate

)

EXPORT_SYMBOL

(

snd_ac97_pcm_assign

)

EXPORT_SYMBOL

(

snd_ac97_pcm_open

)

EXPORT_SYMBOL

(

snd_ac97_pcm_close

)

EXPORT_SYMBOL

(

snd_ac97_pcm_double_rate_rules

)

int snd_ac97_pcm_assign	(	struct snd_ac97_bus *	bus,
		unsigned short	pcms_count,
		const struct ac97_pcm *	pcms
	)

snd_ac97_pcm_assign - assign AC97 slots to given PCM streams : the ac97 bus instance : count of PCMs to be assigned : PCMs to be assigned

It assigns available AC97 slots for given PCMs. If none or only some slots are available, pcm->xxx.slots and pcm->xxx.rslots[] members are reduced and might be zero.

Definition at line 444 of file ac97_pcm.c.

int snd_ac97_pcm_close

(

struct ac97_pcm *

pcm

)

snd_ac97_pcm_close - closes the given AC97 pcm : the ac97 pcm instance

It frees the locked AC97 slots.

Definition at line 648 of file ac97_pcm.c.

int snd_ac97_pcm_double_rate_rules

(

struct snd_pcm_runtime *

runtime

)

snd_ac97_pcm_double_rate_rules - set double rate constraints : the runtime of the ac97 front playback pcm

Installs the hardware constraint rules to prevent using double rates and more than two channels at the same time.

Definition at line 722 of file ac97_pcm.c.

int snd_ac97_pcm_open	(	struct ac97_pcm *	pcm,
		unsigned int	rate,
		enum ac97_pcm_cfg	cfg,
		unsigned short	slots
	)

snd_ac97_pcm_open - opens the given AC97 pcm : the ac97 pcm instance : rate in Hz, if codec does not support VRA, this value must be 48000Hz : output stream characteristics : a subset of allocated slots (snd_ac97_pcm_assign) for this pcm

It locks the specified slots and sets the given rate to AC97 registers.

Definition at line 566 of file ac97_pcm.c.

int snd_ac97_set_rate	(	struct snd_ac97 *	ac97,
		int	reg,
		unsigned int	rate
	)

snd_ac97_set_rate - change the rate of the given input/output. : the ac97 instance : the register to change : the sample rate to set

Changes the rate of the given input/output on the codec. If the codec doesn't support VAR, the rate must be 48000 (except for SPDIF).

The valid registers are AC97_PMC_MIC_ADC_RATE, AC97_PCM_FRONT_DAC_RATE, AC97_PCM_LR_ADC_RATE. AC97_PCM_SURR_DAC_RATE and AC97_PCM_LFE_DAC_RATE are accepted if the codec supports them. AC97_SPDIF is accepted as a pseudo register to modify the SPDIF status bits.

Returns zero if successful, or a negative error code on failure.

Definition at line 258 of file ac97_pcm.c.